For the short of it, I've recently been going through and adding different *_(gem) and treasure-oriented tags to posts. While doing some of this tagging I noticed that pearl_necklace wasn't implicated to pearl_(gem). Before submitting an implication suggestion I decided to check their wiki articles, and this is what was written for pearl_necklace:
Cum on the neck, in the cleavage chest or breast.
For an actual necklace made of pearls, use the tags pearl_(gem) and necklace.
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More info
I searched for posts with pearl_necklace and most of them had a literal pearl_necklace, though there were also many posts that had the kind of pearl_necklace as described in the wiki.
Currently the pearl_necklace tag technically can't have pearl_(gem) implicated to it based on the wiki definition, so I'm wondering what do? Should the current wiki be edited to encompass both, or should two new tags be made for both kinds of pearl_necklace used?
Updated by Siral Exan